<script language="javascript">
    $(document).ready(function() {
      $("#teacherEvaluateCreate").submit( function () {
 
 
            if(($.trim($("#attendance").val()) == '') && ($.trim($("#obtain").val()) == '') &&
               ($.trim($("#expression").val()) == '')) {
                    $("#showMessage").html("<font color='bule'>请至少填写一项内容！</font>")
                    $("#attendance").val('')
                    $("#obtain").val('')
                    $("#expression").val('')
                    return false;
            }
        });
    });
</script>